hey everyone, makes me feel like this is the Audi Bible

. ..
anyhow, i own a 2005 A6 4.2 Sline. my question is , to all other 4.2 owners, do u guys notice a rattle when u press the peddle and want some torque.... i feel it a bit... i have about 80 K in it, do u think its the time for a tune up or something...
its fine and everything, but i believe it should have some more power....
thanks...